Fixes required due to the release of iris-grib v0.15.0

[lbdreyer]

Iris-grib v0.15.0 will be released imminently...

Once it is on conda-forge, it will break the iris-tests due to the inclusion of the new "GRIB_PARAM" cube attribute (which is like a stash attribute but for GRIB files rather than ff/pp.

This PR includes:

• the tests fixes that are required as a result of GRIB_PARAM
• removing the test skipper we had been using to skip the 3 test that were waiting on an iris-grib release before they would pass again

Note in the second commit I have included a temporary change that install iris-grib from master (this is to prove the 3 tests from above are passing so we can happily cut the release). Once iris-grib is in conda-forge I will remove this commit, and replace it with a new commit that puts iris-grib in the requirements file (not in travis.yml).

[lbdreyer]

Tests are failing as I've added a circular dependency.

iris-grib has a dependency on iris so installs the only iris available on conda-forge which is 2.2.0. It's a bit odd; I would have thought, since we install iris into the environment, it would use my branch of iris rather than the one it originally got from conda-forge

I'll push up a commit to fix this shortly

[lbdreyer]

@bjlittle Tests have been fixed now :)
Could you have a look?

[lbdreyer]

I think the test that produced this result file was removed a long time ago. It just so happened that I deleted all the results files in this directory when I was creating the new result files with "IRIS_TEST_CREATE_MISSING"

I have noticed there are a lot of files like this: result files where the tests that use them have been removed

But no harm in removing this now?

[bjlittle]

@lbdreyer Yes please! It'd be great if you could purge this content now.... otherwise it'll fall between the crack, again.

[bjlittle]

iris-grib has a dependency on iris so installs the only iris available on conda-forge which is 2.2.0. It's a bit odd; I would have thought, since we install iris into the environment, it would use my branch of iris rather than the one it originally got from conda-forge

This is why the .travis-ci jumps through a hoop to install iris-grib with --no-deps. Good spot.

That said,

iris/.travis.yml

Lines 103 to 110 in 242a62f

	# TODO : remove when iris doesn't do an integration test requiring iris-grib.
	# test against the latest version of python-eccodes.
	# Conda-forge versioning is out of order (0.9.* is later than 2.12.*).
	- >
	if [[ "${TEST_MINIMAL}" != true ]]; then
	conda install --quiet -n ${ENV_NAME} python-eccodes=0.9.3;
	conda install --quiet -n ${ENV_NAME} --no-deps iris-grib;
	fi

You could remove the TODO, but unfortunately the stuff-up regarding python-eccode versioning still stands 😢

[bjlittle]

Purge the unused files, and address the TODO comment in .travis-ci and we're good to go 😃

[bjlittle]

@lbdreyer Awesome, thanks! 😄

As agreed, you can purge any unused .cml/results files in a separate PR 👍